Swedger



p 3, 1938. F. AMWARD 1 2,130,051

SWEDG'ER Filed May 18, 1937 Inventor E flW/ami fizwaariza M flounder,-

Patented Sept. 13, 1938 UNITED STATES 1 Claim.

My invention relates generally to swedging apparatus, and particularly to a crown swedger adapted to make grooves in the die to facilitate splitting of the die into halves, and to hold the split die in position with the gold shell therein while the plunger of the apparatus is forcing material into the shell to expand the same into the cavity of the die formed by the plaster tooth.

Other important objects of my invention will be apparent from a reading of the following description taken in connection with the drawing, wherein for purposes of illustration I have shown a preferred embodiment of my invention.

In the drawing:

5 Figure 1 is a general transverse vertical sectional view taken through an embodiment of the invention and showing a design in place in the swedging cup.

Figure 2 is a top plan view of the swedging cup 20 showing the grooved forming ribs therein.

Figure 3 is a bottom plan view of Figure 2.

Figure 4 is a transverse vertical sectional View taken through the swedging cup.

Referring in detail to the drawing, the numeral 5 5 generally designates a suitable base or bed which is formed with a vertical cylindrical recess 6 opening through its top and receiving the conformably-shaped swedging cup 1. The recess 6 has at its upper end a laterally extended portion 30 8 to receive the lower end of the plunger barrel 9 which fits snugly around the exposed upper part of the swedging cup I as indicated in Figure 1 of the drawing.

The plunger barrel 9 extends above the base 5 35 and telescoped therein is the plunger I0 which has a suitably formed head at its upper end and a plain or other suitable formation containing bottom l2 for forcing material into the die which is represented by the numeral I3. The structure 40 described in general terms above is considered no part of the present invention as such, but the essence of the invention is considered to reside in the formation of the swedging cup I.

The swedging cup 1 is in accordance with the 45 present invention provided with the tapering PATENT OFFICE opening l2 which opens through the bottom of the cup as indicated by the numeral l3, the opposite sides of the wall of the opening l2 being formed with triangular cross section ribs I4 and I5 or ribs of other cross sections which extend in a radially inward direction and in a vertical direction and in general conform in slant to the slant of the walls of the opening l2 and terminate flush with the bottom of the cup I while extending to the top of the opening I2.

In certain work it is a distinct advantage to be able to accurately and easily split the die formed in the opening l2 of the cup 1, and the present invention, through the provision of the ribs I4 and I5 forms in the opposite sides of the die I3 accurately opposed and formed grooves. These grooves produce weakened lines in the opposite sides of the die which facilitate accurately splitting the die with a minimum amount of work.

Apparatus of this character is especially useful in practicing dental manufacture.

Although I have shown and described herein a preferred embodiment of my invention, it is to be definitely understood that I do not desire to limit the application of the invention thereto, and any change or changes may be made in the materials and in the structure and arrangement of the parts, within the spirit of the invention and the scope of the subjoinecl claim.

What is claimed is:-

A wedging device of the class described comprising a base having a circular opening therein, a circular swedging cup located in the opening and said base having an annular groove in its upper portion surrounding the upper portion of the cup, a barrel having its lower end fitting in the groove, with the upper portion of the cup fitting in the lower end of the barrel, a plunger in the barrel, said cup having a downwardly tapering opening passing therethrough with the small end of the opening opening out through the bottom of the cup and a pair of ribs formed on the walls of the opening and arranged diametrically opposite each other.

FRANK A. WARD. 

